Bay Area school officials told the Chronicle that they’ve taken lessons from every school tragedy to boost security and prevent violence before it happens. And in a letter on Friday, Michelle Chang, principal of San Francisco’s Dianne Feinstein Elementary School, assured parents that “Next week, we will be practicing lockdown procedures again.”

Tree of Life is a group exhibition that celebrates the rich cultural diversity and assorted art styles found at Creativity Explored. The title of the show references the universal image of the “Tree of Life,” which manifests in folklore, mythology, and world religions. The “Tree of Life” is globally known by many different names, for example, The Cosmic Tree, The Holy Tree, Ydryssil, the Bhodi Tree, and The Tree of...